Though Gwen Stefani remains silent about her pregnancy, some of her celebrity friends have reportedly spoken out about how worried they are for the expectant mom based on her partying habits.

"[She's] working through this and even going to a lot of parties and social functions as if she isn't pregnant at all, and she's not interested in having long conversations about it either," a source told Radar Online. "Even when people bring up that she's pregnant, she tries to change the subject."

Stefani's care-free attitude is what has her close friends, like We The Millers actress Jennifer Aniston concerned, according to the insider. "Everybody is wondering how Gwen is doing it, and worrying that she might be pushing herself a bit too hard."

The insider added that Stefani is adamant about not letting the pregnancy keep her down. This is the 44-year-old's third child with husband Gavin Rossdale, 48, and she's treating this pregnancy differently than the first two.

"She doesn't let [this pregnancy] take over her life the way it did when she had her boys," said the source. "It's a very different approach."

Stefani's growing baby bump was on full display at her 7-year-old son Kingston's soccer game on Saturday, Nov. 16.

The No Doubt lead singer wore a black and white striped shirt with grey trimming, and a grey mini skirt for the outing. She covered her legs with a pair of black leggings and black leather boots that went just below the knee. She kept warm with a grey, olive green and black camouflage jacket that was unbuttoned.

Stefani and Rossdale also have 5-year-old Zuma together. They have been married for 11 years.

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